Ghostbusters Trailer...from 1954?

Below is the trailer for what 'Ghostbusters' would have looked like, were it made in 1954. I found the link on Tor.Com (through this link, and here's what they have to say about it: "The casting is spot on (Bob Hope, Jerry Lewis, Dean Martin), the technical aspects of the trailer are just right (witness the floating titles - Cat and Dogs living Together...); this is as near to perfect as you will find."